mdns: don't use non-standard ushot type
mdns: don't use non-standard ushot type

src/mdns.c: In function 'ip_checksum':
src/mdns.c:94:19: error: 'ushort' undeclared (first use in this function)

Signed-off-by: Ferry Huberts <66e11f9f5d965b69497c7e73d5e808f8b13c1218@pelagic.nl>

cholin/olsrd,sebkur/olsrd,diogomg/olsrd-binary-heap,tdz/olsrd,sebkur/olsrd,ninuxorg/olsrd,zioproto/olsrd,ninuxorg/olsrd,nolith/olsrd,tdz/olsrd,nolith/olsrd,cholin/olsrd,diogomg/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,tdz/olsrd,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,diogomg/olsrd-binary-heap,ninuxorg/olsrd,sebkur/olsrd,zioproto/olsrd,zioproto/olsrd,diogomg/olsrd,sebkur/olsrd,tdz/olsrd,ninuxorg/olsrd,zioproto/olsrd,cholin/olsrd,nolith/olsrd,nolith/olsrd,diogomg/olsrd-binary-heap,diogomg/olsrd,sebkur/olsrd,sebkur/olsrd,zioproto/olsrd,diogomg/olsrd,diogomg/olsrd,cholin/olsrd,diogomg/olsrd,nolith/olsrd,tdz/olsrd,ninuxorg/olsrd,cholin/olsrd,diogomg/olsrd-binary-heap